Listed below are Steve measured from the traffic on a busy highway this simple random sample was obtained at 3:30 PM on a weekday is a simple data to construct a 95% confidence in a full estimate of the population standard deviation 60 62 62 56 62 55 61 60 61 69 59 68
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- Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct a 99% confidence interval estimate of the population standard deviation. 65 63 63 57 63 53 60 59 60 68 62 69A mechanic a brand of automobile tire that has a expectancy that is normally distributedwith a mean of 28,000 miles and a standard deviation of 2100 milesHe wants to give a guarantee for free replacement of tires that don't wear well How should he word his guarantee is willing to replace approximately 10% of the ?The current speed limit is 60 mph. This sample of speeds was taken at 4pm on a Monday. Use the data to construct a 80% confidence interval estimate of the standard deviation for the population speeds. 60 62 62 65 56 62 54 61 60 61 69 58 66 what is the lower limit what is the upper limit
- A researcher is interested in finding a 90% confidence interval for the mean number of times per day that college students text. The study included 97 students who averaged 25.5 texts per day. The standard deviation was 20.5 texts. Round answers to 3 decimal places where possible. b. With 90% confidence the population mean number of texts per day is between ______ and _______ texts. c. If many groups of 97 randomly selected members are studied, then a different confidence interval would be produced from each group. About _______ percent of these confidence intervals will contain the true population number of texts per day and about ___________ percent will not contain the true population mean number of texts per day.HelpMale: 65 75 69 58 83 88 59 80 76 62 93 Female: 65 78 67 78 77 72 98 99 80 76 72 75 Assume both follow a Normal distribution. What can be concluded at the the a = 0.10 level of significance level of significance? For this study, we should use Select an answer a. The null and alternative hypotheses would be: Ho: Select an answer v Select an answer v Select an answer v (please enter a decimal) (Please enter a decimal) H1: Select an answer v Select an answer v Select an answer b. The test statistic ? v = (please show your answer to 3 decimal places.) c. The p-value = (Please show your answer to 4 decimal places.) d. The p-value is ? a e. Based on this, we should Select an answer v the null hypothesis. f. Thus, the final conclusion is that ... O The results are statistically significant at a = 0.10, so there is sufficient evidence to conclude that the mean final exam score for the eleven men that were observed is not the same as the mean final exam score for the twelve women that were…
- Listed below are systolic blood pressure measurements (mm Hg) taken from the right and left arms of the same woman. Assume that the paired sample data is a simple random sample and that the differences have a distribution that is approximately normal. Use a 0.05 significance level to test for a difference between the measurements from the two arms. What can be concluded? 143 140 141 136 133 Right arm Left arm 180 174 192 140 144 In this example, . is the mean value of the differences d for the population of all pairs of data, where each individual difference d is defined as the measurement from the right arm minus the measurement from the left arm. What are the null and alternative hypotheses for the hypothesis test? O A. Ho: Ha = 0 O B. Ho: Hd #0 0 = Prt :H O D. Ho: Hd =0 H O C. Ho: Ha 0 Identify the test statistic. t%3D (Round to two decimal places as needed.) Identify the P-value. P-value (Round to three decimal places as needed.) What is the conclusion based on the hypothesis test?…Given two dependent random samples with the following results: Population 1 48 29 32 29 38 31 28 Population 2 45 38 41 16 40 28 38 Use this data to find the 95% confidence interval for the true difference between the population means. Assume that both populations are normally distributed. Copy Data Step 2 of 4 : Calculate the sample standard deviation of the paired differences. Round your answer to six decimal places.which of the following sample data: sample size= 100 sample mean= 340z/hr sample variance= 90z/ hr construct a 98% confidence interval for μ. the population mean is what?
- A recent article in a business journal reported that the mean annual salary for graduates from 30 top MBA programs 10 years after graduation is $275,000 Assume the standard deviation is $54,500? 23 The middle interval that captures 95% of the mean salaries from samples of size 75 graduates is, a $262,666 $287,334 b $259,582 $290,418 c $255,728 $294,272 d $250,910 $299,09016 34 41 21 340 A survey of 25 randomly selected customers found the ages shown (in years). The mean is 31.64 years and the standard deviation is 9.62 years. a) What is the standard error of the mean? 38 43 26 43 20 b) How would the standard error change if the sample size had been 400 instead of 25? (Assume that the sample standard deviation didn't change.) 26 20 36 32 32 35 11 25 48 30 31 25 40 46 38 a) The standard error of the mean is (Round to two decimal places as needed.) b) How would the standard error change the sample size was 400 instead of 25 with the same sample standard deviation? Select the correct choice below and fill in any answer boxes within your choice. O A. The standard error would increase. The new standard error would be times the old, O B. The standard error would decrease. The new standard error would be the old standard error divided by O C. The standard error would not change.A researcher wants to know if the news station a person watches is a factor in the amount of time (in minutes) that they watch. The table below shows data that was collected from a survey. CNN Fox Local 45 15 72 12 43 37 18 68 56 38 50 60 23 31 51 35 22 Assume that all distributions are normal, the three population standard deviations are all the same, and the data was collected independently and randomly. Use a level of significance of 0.05. H0: CNN = Fox = Local Ha: At least two of the means are different from each other. Calculate the p-Value. p-Value = ______________ Conclusion: ["", "", "", ""]
